pull oneself up by bootstraps
pull (oneself) up by (one's) (own) bootstraps
To put forth effort to improve one's life or circumstances, rather than relying on others. After I declared bankruptcy, I had to pull myself up by my bootstraps and rebuild my financial standing. I know you're heartbroken by this breakup, but you just have to pull yourself up by your own bootstraps and get back out there into the dating scene.
pull oneself up by one's (own) bootstraps
Fig. to improve or become a success by one's own efforts. If Sam had a little encouragement, he could pull himself up by his bootstraps. Given a chance, I'm sure I can pull myself up by my own bootstraps.